Tandem-season opened

Today we did the first bike-trip with tandem bicycle and in the middle of the trip it turned out to be a beautiful day. Here's a pause in the park, there was a nice looking labyrinth too (uploaded that & couple other photos of the trip to Flickr - now for few days they'll be in top of my photostream).

I've been wondering: is there also woman-man, woman-woman and man-man -tandem bicycles...? Ó_o